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In these insects it consists almost invariably of three lobes, the outer being the palpus, the middle lobe the galea, and the innermost the lacinia; the latter undergoing the greatest modifications, forming a comb composed of spines and hairs varying greatly in relative size and length. How much the palpi vary in these groups of insects is well known.
In this family the body is long and slender, and the segments much alike in size. There is a pair of spiracles on each thoracic ring. The maxillæ are comb-shaped, due to the four slender, minutely ciliated spines placed within the outer tooth. The labium in Japyx is four-lobed and bears a small two-jointed palpus.
It is of a blackish lead color; a, end of tibia bearing a tenant hair, with the tarsal joint and large claw; b, spring; c, the third joint of the spring, with the little spine at the base; figure 163, the supposed ovipositor; a, the two blades spread apart; b, side view. The mouth-parts in this genus are much as in Tomocerus, the maxillæ ending in a lacinia and palpus.
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